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Thus, when users pick recipients when sending messages, they may be sending messages to non-existent recipients or invalid e-mail addresses, which create issues like non-delivery of e-mail.

Auto Resolve uses your Contacts folder but Auto Complete suggests entries from a hidden system file with a .Recently I wrote a few posts about How to Clear the Outlook Auto Complete Cache and How to Fix a problem where the Outlook Auto Complete cache was REALLY slow.BUT, what if you just want to disable the Auto Complete functionality? Just follow these three easy steps for both Microsoft Outlook 2007 and Outlook 2003.A “cache,” also known by its file extension, NK2 in older Outlook clients, is a convenience feature in Outlook and Outlook Web App (OWA) which lets users pick recipients from a list of frequently-used recipients.This list is displayed when the end user types in the first few letters.